Shure 581SF, 581SA User Guide

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UNIDIRECTIONAL DYNAMIC MICROPHONES

General:

phones are moving coil dynamic units built to provide
excellent reproduction of music and voice and to feature
an exceptionally good unidirectional microphone pickup
pattern.

These microphones are particularly suitable for use in
theatres, night clubs, auditoriums, schools, churches, and
any place where ordinary microphones may not operate
properly because of poor acoustics. These microphones
will in almost every instance eliminate the annoying
"squeals and howls" caused
they will prevent echoing (boominess) that sometimes
occurs in partially-filled halls. These microphones can
also be used closer to loudspeakers than usual, without
creating feedback problems.

This

smooth sound, makes them particularly good for use with
orchestras, small combos, and singers.

In addition, the microphone features:

e

A

lected because of
pickup".

0

An easily field-replaceable microphone cartridge.

A

internally, which permits quieter handling.

A

the switch in
An adjustable swivel adapter that enables you to

aim the microphone where you want

0

A

it

use

The Model

into high impedance microphone inputs.

The Model

ohms and
required, or where there are conditions of severe hum
disturbance.
pedance amplifier, use a Shure Model
ing Transformer.

The Model

is

designed for installations where lower impedances

and
are required.

The Model

A

Unidirectional Dynamic Microphones. The units are
matched within
frequency response.

For convenient connection to most tape recorders,

standard phone plugs have been installed on the Model

58

I

SA-MP

tions, and performance data listed for the Model
apply to the Model

The Model

suppression of feedback, combined with

strong, easily disconnected cable, especially se-

cartridge that

built-in "on-off'' switch with a device to lock

581

its

is

its

"on" position.

Series Unidyne A Micro-

by

feedback. In addition,

good shielding from "hum

protectively shock-mounted

it.

plastic cushioned slot in the swivel that makes

easy to quietly pull the microphone out and

it

comfortably in the hand.

581SA

is

recommended where long cable lengths are

To

581SF

58

microphone cables.

is

high impedance for connection

581SB

I

has a low impedance of

use the Model

has a low impedance of

SA-MP

1.0

is

db

in level and within

581SB

a

set

of two matched Unidyne

All

with a

A95A

features, specifica-

high

Line Match-

25

ohms

1.5

db

58

581SA-MP

Microphones.

their

150

im-

for

I

SA

Models

The matched Model
intended for stereo recording or similar use. Many
acoustic conditions affect the final placement of micro­phones during a stereo recording.
to experiment with various locations of the microphones
to achieve placement best suited to your individual re­quirements. For pickup of large groups,
advisable to raise the microphones above the performers
to gain balance between front and rear of the group.

581SB

and

581SF

58

I

SA

Model

Microphones are primarily

It

is

usually necessary

it

SPEC1 FICATIONS

Type:
Frequency Response:

Polar Pattern:

Microphone

Model 58

Model

Model 581SF

,

QUtpU* Level:

Model

Model 58

Dynamic

50

to

12,000

HZ

Cardioid (unidirectional) Response.
Uniform with frequency, symmetrical

1

.O

B)

db

(I

d b***

db*

db**
db***

about axis (See Figure

Rating

I

SA

581SB

For connecting into microphone inputs rated at
to 200 ohms

For connection into microphone inputs rated at

,to

50 ohms

581SA

Open circuit voltage

EIA

Microphone Rating

Gm (Sensitivity)

Open circuit voltage
Power Level

EIA

Microphone Rating

Gm (Sensitivity)

ISB

'

150 ohms Impedance

...._._...__..._____.....

Impedance:

High

150 ohms

25

1000

Hz

High

Impedance

.__.__.____

_...___..._._._-

_..________

Impedance

ohms

(cps) Response

-

56.5

I

52.5

-

79.5

-

57.0

I

5

581SA

may be

(CPS)

.48

mv]

(.

I05 mv)

50

25

Copyright
27A357

1965,

(ME)

Shure Brothers, Inc.

U.S.

Patent 3,132,713. Other patents pending.

Printed in

U.S.A.

I

1

,

1

I

I

I

!

I

I

i

I

i

I

Model 581SF

Open circuit voltage
Power Level

EIA

Microphone Rating

Gm (Sensitivity)

*

0

db

=

I

**

0

db

=

I

***

0

db = EIA

Switch:

Shock

Case:

Case

Built-in
nished. Microphone
installed. To lock switch in
loosen screw on lockplate and turn lockplate

I

80°. Retighten screw.

Mom*:

Die-cast and "Armo-Dur".

Finish:

Dimensions:

/I~l!~rn)~~j (38.1

f

1'?(6

(46.0

mm)

25

ohms Impedance

_._________

-

87.5

db*

(.043

...

..

...

....__..._.___

volt per microbar

milliwaft with

Standard

SE-105,

"ON-OFF''

Internal vibration-isolation of rubber

construction.

Chrome and Gray with stainless steel
grille.

See Figure

57.0

db**

-152.5

10

microbars

switch with lockplate fur-

is

db***

August

shipped wifh lockplate

"ON"

1949.

position,

A.

mm)

(6.4

mv)

mm)

This

Guarantee:

normal use to be free from electrical and mechanical
defects for a period of one year from the date of
purchase. Please retain proof of purchase date.
guarantee includes all parts and labor.

Skipping

and return
United States, return the unit to your dealer or Author­ized Shure Service Center for repair. The unit will be
returned to you prepaid.

ins#ructisns:

it

prepaid to the factory.

Skure product

70

TO

250

HERTZ

is

guaranteed in

This

Carefully repack the unit

If

outside the

'I

I

I

I

i

I

I

I

I

I

I

Net

OVERALL

Weight:

FIGURE

13

OZ.

DIM

(369

ENS

A

gms)

IONS

FURNllSHED ACCESSORIES:
Cable:

Highly

hum shielding.

Model

Model

Model 581SF and

581SA

Detachable
shielded cable with microphone connector.

58

Detachable 15-foot

shielded cable with microphone connector and

a standard phone plug attached.

Detachable 18-foot (5.5 meter) two-conductor
shielded cable with microphone connector
attached.

durable with exceptionally effective

I5

foot

(4.6

meter) one-conductor

I

SA-MP

(4.6

meter) one-conductor

581SB

(10.3

13

'32

mm)

TYPICAL DIRECTIONAL PATTERN

FIGURE

7.000

B

TO

IO.OOOHERTZ

I

I

I

I

I

I

I

Swivel Adapfer:

Model A25B, long life,
quality swivel connector, lined
with a long-life nylon sleeve for
noise free and scratch-free in­sertion and removal of micro­phone.

high

TYPICAL DIRECTIONAL PATTERN

FIGURE

B

Replacement Components Installation
and Connections:

Model R58 Dynamic Replacement

for Models 58

Model

Model 94A344 Replacement

R58F

for Model 581SF

A.

To install the R58 Cartridge in Shure Models

I

SA

58
Shure Model

I.

Holding microphone in vertical position with
head upper most, unscrew (turn counterclock­wise) and remove the microphone cap-grille
assembly and the metal washer. See Figure

2.

Gently remove cartridge from the case.

3.

Unsolder the leads from old cartridge terminals.

4.

Connect the leads to the new replacement car­tridge. Note the lead color and terminal coding
as in Figure

5.

Assemble cartridge into case making sure
properly seated in the notches provided.
prevents the cartridge from turning when cap­grille assembly

6.

Re-assemble metal washer and cap-grille assem-

bly.

B.

To

install the
Shure Models
as follows:

I.

Remove cartridge as in Section

disconnect the leads from the cartridge.

Remove "lambs wool" packing from inside

2.

microphone case. Long nose pliers or tweezers

may be used for

3.

Remove the two

screws, located at both ends of the switch

button.

Reach in with long nose pliers or tweezers and

4.

pull out the switch

or the switch-transformer assembly
58

5.

Disconnect the leads from the old switch termi-

nals and remove old switch from the plastic

transformer bracket

I

SA

and

58

I

SB

Dynamic Replacement

SWITCH

or 58

I

SB,

and the R58F

581SF,

Make sure the cap

94A344

581SA,

proceed as follows:

D-l

and D-2.

is

screwed on.

Redacement Switch in the

58I'SB, and

this.

#4-40

(if

I

SA).

CARTRIDGE

CARTRIDGE

CARTRIDGE

is

tightened securely.

581SF,

oval head machine

a Model

(if

a Model

581SB

"A"

but do not

(if

581SA).

in the

proceed

or 581SF)

a Model

C.

it

is

This

MODEL

MODEL

SWITCH SHOWN

'OFF'

58

ISA

SWITCH SHOWN

CASF

GROUND

58

I

SB

AND

58

Connect the leads to the new replacement
switch. Observe lead color and terminal ar­rangement as in Figure

NOTE:

Re-assemble switch or switch-transformer com­bination back into the case and fasten securely
with the two
longer screw
cable) end of the switch.

Replace the "Iambs wool" packing.
ing
loose packing

Re-assemble cartridge into case and replace
cap-grille assembly as in Section "A''-steps

5

When the
is

installed in the Model
sponge rubber gasket
must be removed.

is

necessary around the transformer but

and

6.

IN

POSITION7

INTERNAL

FIGURE

FIGURE

IN

I

SF

INTERNAL

94A344

AMLUFN~I

CABLE-PLUG

CONNECTIONS

D-l

CONNECTIONS

D-2

D-l

and
replacement switch

ASSEMBLY

CABLE-PLUG

ASSEMBLY

D2.

581SA,

on

the switch

#4-40

is

oval head screws. The

used at the bottom (toward

Tight

is

required above the transformer.

the

pack-

EXPLODED

VIEW

OF

FIGURE

*4-40

\

MODEL

OVAL HEAD SCREW

+SLIDE SWITCH

OVAL HEAD

58

I

SA

MICROPHONE

C

SCREW